AHMAD, Tanveer; SHINN, Glen C. Modeling Tractor Selection Decisions for Developing Countries: Implecations for Extention Education. Journal of Agricultural Systems, Technology, and Management, [S. l.], v. 4, n. 2, p. 4–12, 1989. Disponível em: https://jastm.org/index.php/jastm/article/view/11917. Acesso em: 23 feb. 2025.